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itertools.chain should evaluate lazily #3787

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rng-dynamics opened this issue Jun 14, 2022 · 3 comments · Fixed by #3788
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itertools.chain should evaluate lazily #3787

rng-dynamics opened this issue Jun 14, 2022 · 3 comments · Fixed by #3788

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@rng-dynamics
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rng-dynamics commented Jun 14, 2022 •
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CPython:

>>> from itertools import *
>>> a = chain.from_iterable(repeat(range(2)))
>>> next(a)
0
>>> next(a)
1
>>> next(a)
0

RustPython does not evaluate lazily and the call to from_iterable never returns:

>>>>> from itertools import *
>>>>> a = chain.from_iterable(repeat(range(2)))
@rng-dynamics rng-dynamics mentioned this issue Jun 14, 2022
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@youknowone
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This test looks missing in CPython

python/cpython#93815

@youknowone youknowone mentioned this issue Jun 14, 2022
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@youknowone
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youknowone commented Jun 14, 2022 •
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Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

@rng-dynamics
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Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

In #3788 I added a similar test.

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Fix itertools chain rng-dynamics/RustPython
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@youknowone @rng-dynamics